Fixed an issue #145
Fixed an issue #145

OpenStreetBugs were not updated when closed or added comment.
The problem was in line  `if (feature._popup)` where we got UncaughtException
as `feature` was `undefined` at this point so we couldn't look for property `popup`.

ErshKUS/OpenStreetMap.ru,ErshKUS/OpenStreetMap.ru,ErshKUS/OpenStreetMap.ru,ErshKUS/OpenStreetMap.ru